# Search for new physics in top quark production with additional leptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV using effective field theory

HV CMOS Collaboration; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Escalante Del Valle, A.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Lechner, L.; Liko, D.; Mikulec, I.; Pitters, F. M.; Rad, N.; Schieck, J.; Schöfbeck, R.; Spanring, M.; Templ, S.; Waltenberger, W.; Wulz, C.-E.; ... mehr

##### Abstract:
Events containing one or more top quarks produced with additional prompt leptons are used to search for new physics within the framework of an effective field theory (EFT). The data correspond to an integrated luminosity of 41.5 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC, collected by the CMS experiment in 2017. The selected events are required to have either two leptons with the same charge or more than two leptons; jets, including identified bottom quark jets, are also required, and the selected events are divided into categories based on the multiplicities of these objects. Sixteen dimension-six operators that can affect processes involving top quarks produced with additional charged leptons are considered in this analysis. Constructed to target EFT effects directly, the analysis applies a novel approach in which the observed yields are parameterized in terms of the Wilson coefficients (WCs) of the EFT operators. A simultaneous fit of the 16 WCs to the data is performed and two standard deviation confidence intervals for the WCs are extracted; the standard model expectations for the WC values are within these intervals for all of the WCs probed.

 Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)KIT-Zentrum Elementarteilchen- und Astroteilchenphysik (KCETA)Institut für Telematik (TM)Institut für Experimentelle Teilchenphysik (ETP)Institut für Astroteilchenphysik (IAP)Young Investigator Network (YIN)Steinbuch Centre for Computing (SCC) Publikationstyp Zeitschriftenaufsatz Publikationsmonat/-jahr 03.2021 Sprache Englisch Identifikator ISSN: 1029-8479 KITopen-ID: 1000131918 Erschienen in Journal of high energy physics Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA) Band 2021 Heft 3 Seiten Art. Nr.: 95 Vorab online veröffentlicht am 09.03.2021 Schlagwörter Beyond Standard Model, Hadron-Hadron scattering (experiments), Topphysics Nachgewiesen in ScopusWeb of Science
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